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// Copyright (c) PLUMgrid, Inc.
// Licensed under the Apache License, Version 2.0 (the "License")
// test for packet modification
#packed "false"
struct IPKey {
u32 dip:32;
u32 sip:32;
};
struct IPLeaf {
u32 xdip:32;
u32 xsip:32;
u64 xlated_pkts:64;
};
Table<IPKey, IPLeaf, FIXED_MATCH, NONE> xlate(1024);
struct skbuff {
u32 type:32;
};
u32 on_packet (struct skbuff *skb) {
u32 ret:32 = 1;
u32 orig_dip:32 = 0;
u32 orig_sip:32 = 0;
struct IPLeaf *xleaf;
goto proto::ethernet;
state proto::ethernet {
}
state proto::dot1q {
}
state proto::ip {
orig_dip = $ip.dst;
orig_sip = $ip.src;
struct IPKey key = {.dip=orig_dip, .sip=orig_sip};
xlate.lookup(key, xleaf) {};
on_valid(xleaf) {
incr_cksum(@ip.hchecksum, orig_dip, xleaf.xdip);
incr_cksum(@ip.hchecksum, orig_sip, xleaf.xsip);
// the below are equivalent
pkt.rewrite_field($ip.dst, xleaf.xdip);
$ip.src = xleaf.xsip;
atomic_add(xleaf.xlated_pkts, 1);
}
}
state proto::udp {
on_valid(xleaf) {
incr_cksum(@udp.crc, orig_dip, xleaf.xdip, 1);
incr_cksum(@udp.crc, orig_sip, xleaf.xsip, 1);
}
}
state proto::tcp {
on_valid(xleaf) {
incr_cksum(@tcp.cksum, orig_dip, xleaf.xdip, 1);
incr_cksum(@tcp.cksum, orig_sip, xleaf.xsip, 1);
}
}
state proto::vxlan {
}
state proto::gre {
}
state EOP {
return ret;
}
}
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